B O N U S & V A R I A B L E P A Y
Bonus income mortgage: how lenders assess your bonus and what it means for borrowing
Your bonus may be the largest component of your pay — but mortgage lenders don't treat it the same way as salary. How it's averaged, capped, or discounted often matters more than the headline number.
Y O U R T E A MYou'll speak with a broker who structures bonus income applications every week.
David Walsh
Director & Mortgage Broker
Founder of Kite Mortgages. Specialist in complex income structures for City professionals. Advises on mortgage strategy for high earners with partnership income, bonus-heavy pay, equity compensation, and foreign currency earnings.
View profile →
Simon Hart
Mortgage & Protection Adviser
Mortgage adviser at Kite Mortgages. Specialises in high-value purchases and remortgages for City professionals. Works with clients navigating complex income structures including variable pay, carried interest, and multi-currency earnings.
View profile →I N C O M E A S S E S S M E N THow Lenders Assess Bonus Income for Mortgages
Most mortgage lenders separate your income into two categories: fixed salary and variable pay. Your salary is usually taken at face value. Your bonus is not.
The reason is straightforward. From a lender's perspective, bonuses are discretionary, influenced by market conditions, and subject to firm and desk performance. Even if your bonus has been paid consistently for years, underwriters are focused on downside protection — not peak earnings. The result is that affordability often reflects a blended or smoothed view of income rather than your most recent year alone.
That said, approaches vary enormously between lenders. The difference between the right lender and the wrong one, on identical income, can be hundreds of thousands of pounds in borrowing power.
The Three Main Approaches
Averaging over two or three years
This is the most common approach. Lenders take your last two (sometimes three) years of bonus income and calculate an average. If you received £125k last year and £150k the year before, the average is £137,500. They then include a percentage of that figure — typically 50% to 75% — in your affordability assessment.
This approach rewards consistency but penalises growth. If you've been promoted and your bonus has increased significantly, averaging pulls the number down.
Most recent year only
A smaller number of lenders — particularly private banks and some high street large-loan teams — will use your most recent bonus alone, especially where there's a clear upward trajectory. This is usually the best outcome if your income has increased following a promotion or a move to a more senior role.
You'll typically need supporting evidence: a bonus award letter from your employer, payslips showing the payment, and ideally a written explanation for the increase.
Capped at a percentage of base salary
Some lenders cap the amount of bonus they'll include relative to your basic salary. If your base is £150k and your bonus is £300k, a lender that caps bonus at 100% of base will only use £150k of your £300k bonus — regardless of how consistent it's been.
This approach is most restrictive for professionals whose bonus materially exceeds their base, which is common in investment banking, trading, and senior finance roles.
That's a difference of over £112k in assessed income — which at a 5x multiple translates to more than £500k of additional borrowing power, from the same person with the same income.
What Counts as a Bonus (And What Doesn't)
Annual or semi-annual discretionary bonuses
The most common type in law, banking, consulting, and finance. Usually included in part, subject to track record and averaging.
Guaranteed bonuses and retention awards
Stronger than discretionary in lending terms, particularly if documented in your contract. Some lenders treat these closer to salary.
Sign-on bonuses
Generally excluded. Lenders can't treat a one-off payment as recurring income, so these rarely contribute to affordability. They can, however, be used as deposit.
Commission and performance pay
Grouped with variable income and typically averaged or discounted. Regular monthly commission is treated more favourably than annual lump sums.
Profit share and LLP drawings
If you're an equity partner, your income is assessed as self-employed or LLP income, not as a bonus. Different evidence and different lender approaches apply.
See our guide for law firm partners →
RSUs and deferred stock
A separate category entirely. Some lenders will consider vested and evidenced equity awards; unvested awards are far less likely to count.
When Bonus Averaging Works Against You
Averaging is designed to smooth income volatility, but it can actively work against you in several situations:
Your income has increased materially following a promotion. If you moved from associate to VP and your bonus jumped from £80k to £180k, a two-year average of £130k understates your current earning capacity.
One weaker year skews the average downward. A low bonus year — whether from a desk move, a market downturn, or a gap between roles — pulls the average below what your income actually looks like now.
Your current role and earning capacity aren't reflected in historic figures. If you've changed firms or sectors and your trajectory is clearly upward, historical averaging may not capture the picture accurately.
In each of these cases, the methodology — not the income itself — becomes the limiting factor. The solution is usually lender selection: finding a lender whose policy for bonus assessment aligns with your specific income profile.
Lender-Specific Approaches
Lender treatment of bonus income varies significantly. Here's a general overview of how different types of lender approach it — though policies change regularly and individual cases are assessed on their merits.
Bonuses Paid in Foreign Currency
If part or all of your bonus is paid in a foreign currency — USD is the most common for our clients — lenders apply a haircut to the converted amount. This is typically 10% to 25% depending on the lender and the currency.
The haircut is designed to account for exchange rate risk. If you receive a $200k bonus, a lender applying a 20% haircut will assess it as $160k, then convert to GBP at their reference rate.
The difference between lenders on currency haircuts alone can be material. On a £200k USD-denominated bonus, the gap between a 10% and 25% haircut is over £30k of assessed income — which translates to £150k+ of borrowing power.
D O C U M E N T R E Q U I R E M E N T SDocuments You'll Need for a Bonus Income Mortgage
Lenders need to see clear evidence that your bonus is real, recurring, and consistent. Here's what's typically required:
Core Documents
Latest three months’ payslips
Including the payslip that shows your bonus payment
P60 for the most recent tax year
Confirms total earnings including bonus
Bonus award letter
On employer letterhead — confirming amount, payment date, period covered, and whether guaranteed or discretionary
Bank statements (3–6 months)
Showing the bonus credit landing in your account — underwriters need to see the money arrive
Helpful Additions
Previous year’s bonus evidence
Payslip or annual compensation statement to demonstrate a consistent track record
Employer confirmation letter
Where the payslip description is unclear — some label bonuses as “variable pay” or “supplementary payment”
For foreign currency bonuses
Original statements in the source currency plus the GBP conversion trail
For RSUs or deferred awards
Vesting schedule and broker/plan statements showing units vested and cash value received
Timing Tips
Apply after your bonus has landed
Underwriters can only use what’s evidenced — if your bonus pays in March, a February application may undercount your income
Mind the averaging window
If last year’s bonus was unusually low, consider waiting until the current bonus pays and the two-year average improves
Line up documents early
Bonus letters can lag payroll by weeks — request yours as soon as the award is finalised
Avoid large new commitments before application
New loans or credit cards taken out before applying can erode the affordability gains from bonus inclusion
W H O T H I S A P P L I E S T OWhich Professionals Rely on Bonus Income?
Bonus income is a factor across many of the professions we work with, though the structure and scale varies. If your bonus makes up a significant portion of your total compensation, start with the guide below that matches your role — then come back here for the detail on how lenders assess the variable element.
Investment Banking Professionals
Discretionary annual bonuses often exceed base salary, frequently paid in USD. Bonus averaging and currency haircuts are the two biggest variables.
View guide →
Lawyers & Law Firm Partners
Associates receive performance bonuses; partners receive profit share (assessed differently). Bonus treatment varies by career stage.
View guide →
Trading & Investment Professionals
Bonus-led compensation is the norm. Base salary is often a small fraction of total pay, making lender selection critical.
View guide →
Private Equity & Hedge Fund Professionals
Variable pay includes performance allocations, carried interest, and co-invest returns — alongside discretionary bonuses. Most require specialist structuring.
View guide →
R E L A T E D G U I D E S
Explore related guides
Foreign Currency Income
How lenders treat USD, EUR, and other non-GBP earnings — including haircuts and which banks accept which currencies
Equity Compensation & RSU Mortgages
RSUs, stock options, ESPP, and deferred equity awards — how lenders assess non-cash compensation
Large Mortgage Loans
Routes to borrowing above £1m via high street large-loan teams and private banks
Interest-Only for High Earners
When interest-only makes sense as part of a broader wealth strategy — and how bonus income supports the required repayment vehicle
A R T I C L E SArticles on bonus and variable income
C A S E S T U D I E SHow we've helped clients with bonus income
F A Q sFrequently Asked Questions
-
Yes. Most UK mortgage lenders will include some or all of your bonus income in their affordability assessment — but how much they count varies significantly. Common approaches include averaging your last two years of bonuses and including 50% to 75% of that figure, or using the most recent year's bonus alone. The key variables are the lender's specific policy, your bonus track record, and how the income is documented. Guaranteed bonuses are generally treated more favourably than discretionary ones.
-
There's no single method. Most mainstream lenders average your bonus over two years and include a percentage — often 50% to 75% — of the average. Some cap bonus at a fixed proportion of your base salary. A smaller number of lenders, particularly private banks and high street large-loan teams, will use your latest year's bonus at a higher inclusion rate. The right approach depends on your income profile and which lender's policy aligns best with it.
-
It depends on your specific situation. High street large-loan teams (typically for loans above £750k to £1m) often offer the best combination of competitive rates and flexible bonus treatment. Private banks are the most flexible on bonus income but charge higher rates and fees. For standard high street channels, bonus treatment tends to be more restrictive. A broker who understands bonus-led income can identify which lender's policy will deliver the strongest outcome for your profile.
-
Some will — particularly private banks and certain large-loan teams assessing senior professionals with a consistent multi-year track record. However, most mainstream lenders include a proportion rather than the full amount, commonly 50% to 75% of an averaged figure. The inclusion rate depends on the lender's policy, the type of bonus (guaranteed vs discretionary), and the strength of your evidence.
-
Not automatically. Most lenders average over two or more years, which dilutes a recent increase. However, some lenders will give greater weight to the most recent year — or use it exclusively — if you can demonstrate a credible reason for the uplift (such as a promotion, increased seniority, or a move to a higher-paying role) and provide supporting documentation. Lender selection is critical in this scenario.
-
Yes. Bonus income sitting in your bank account can be used as deposit, provided you can evidence where the funds came from. Lenders may ask for the bonus payslip, the bank statement showing the credit, and confirmation that the funds are not borrowed. Sign-on bonuses — while not usable for affordability — can also be used as deposit.
-
Lenders will convert the bonus to GBP and then apply a haircut — typically 10% to 25% — to account for exchange rate risk. The size of the haircut varies by lender and by currency. On a large bonus, the difference between a 10% and 25% haircut can translate to a substantial difference in borrowing power. We work with all the major lenders that accept foreign currency income and know how to minimise the impact.
-
Not always. While most mainstream lenders prefer two years of bonus evidence, some will accept a single year — particularly if you're in a recognised profession, your employer confirms the bonus is expected to continue, and the rest of your financial profile is strong. Private banks and some specialist teams are more flexible on track record requirements.
W H Y U S E A B R O K E RHow Kite Mortgages Helps With Bonus Income
We structure bonus income applications every week. We know which lenders use the latest year, which average over two or three, which cap at base salary, and which apply the most favourable inclusion rates for your profession. We also know which teams within each lender handle complex income most effectively — because accessing the right underwriting desk matters as much as choosing the right lender.
We'll review your income, identify the strongest lender fit, tell you exactly what documents to prepare, and package the application so your bonus is positioned as clearly as possible. If your bonus is paid in foreign currency, we'll model the haircut across multiple lenders to find the best outcome.